A mathematical model is presented relating the presence of NO 2 in the oxidant stream to the fuel cell performance loss. Both contamination and recovery processes are considered. The model is validated using cell voltage/current density distribution and cell voltage change as a function of NO 2 concentration transient data. The model is used to discuss NO 2 threshold concentrations and contaminant screening. General and NO 2 specific gaps in contaminant characterization methodology are also highlighted.

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